Fluid Mechanics: Fundamentals and Applications
4th Edition
ISBN: 9781259696534
Author: Yunus A. Cengel Dr., John M. Cimbala
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 6, Problem 31P
Firefighters are holding a nozzle at the end of a hose while trying to extinguish a fire. If the nozzle exit diameter is 8 cm and the water flow rate is 12 m3/min, determine (a) the average water exit velocity and (b) the horizontal resistance force required of the firefighters to hold the nozzle.
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(see img)
A 6-cm-diameter horizontal water pipe expands gradually to a 9-cm-diameter pipe. The walls of the expansion section are angled 30° from the horizontal. The average
velocity and pressure of water before the expansion section are 7 m/s and 150 Ka, respectively. Determine the head loss (m) in the expansion section.
6 cm
9 cm
Water
7 m/s
150 kPa
Gradual Expansion and Contraction (based on the velocity in the smaller-diameter pipe)
Expansion:
K = 0.02 for 0 = 20°
K = 0.04 for 0 = 45°
K = 0.07 for 0 = 60°
Contraction (for 0 = 20°):
K = 0.30 for d/D = 0.2
K = 0.25 for dlD = 0.4
K, = 0.15 for diD = 0.6
K = 0.10 for dlD = 0.8
%3D
-v d
d
%3D
Chapter 6 Solutions
Fluid Mechanics: Fundamentals and Applications
Ch. 6 - Express Newton’s second law of motion for rotating...Ch. 6 - Express Newton’s first, second, and third laws.Ch. 6 - Is momentum a vector? If so, in what direction...Ch. 6 - Express the conservation of momentum principle....Ch. 6 - How do surface forces arise in the momentum...Ch. 6 - Explain the importance of the Reynolds transport...Ch. 6 - What is the importance of the momentum-flux...Ch. 6 - Write the momentum equation for steady...Ch. 6 - In the application of the momentum equation,...Ch. 6 - Two firefighters are fighting a fire with...
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